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Issue 42001: Breakpad Linux Dumper: remove compilation warnings in guid_creator.cc.

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Building on Ubuntu 9.10 with the distributed compiler (GCC 4.4.1), we get
warnings like the following:

guid_creator.cc:56: warning: dereferencing type-punned pointer will break strict-aliasing rules

It doesn't matter in this case, but there's no crying need to use
reinterpret casts in an endian-dependent way when there are plenty of
well-defined ways to get the same effect.

a=jimblandy, r=nealsid


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@447 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
jimblandy@gmail.com 2009-12-15 17:11:54 +00:00
parent 4969cfc647
commit 07466260e2
1 changed files with 18 additions and 4 deletions
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22
src/common/linux/guid_creator.cc
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@ -49,12 +49,26 @@ class GUIDGenerator {
srandom(time(NULL)); srandom(time(NULL));
} }
static u_int32_t BytesToUInt32(const u_int8_t bytes[]) {
return ((u_int32_t) bytes[0]
| ((u_int32_t) bytes[1] << 8)
| ((u_int32_t) bytes[2] << 16)
| ((u_int32_t) bytes[3] << 24));
}
static void UInt32ToBytes(u_int8_t bytes[], u_int32_t n) {
bytes[0] = n & 0xff;
bytes[1] = (n >> 8) & 0xff;
bytes[2] = (n >> 16) & 0xff;
bytes[3] = (n >> 24) & 0xff;
}
bool CreateGUID(GUID *guid) const { bool CreateGUID(GUID *guid) const {
guid->data1 = random(); guid->data1 = random();
guid->data2 = (u_int16_t)(random()); guid->data2 = (u_int16_t)(random());
guid->data3 = (u_int16_t)(random()); guid->data3 = (u_int16_t)(random());
*reinterpret_cast<u_int32_t*>(&guid->data4[0]) = random(); UInt32ToBytes(&guid->data4[0], random());
*reinterpret_cast<u_int32_t*>(&guid->data4[4]) = random(); UInt32ToBytes(&guid->data4[4], random());
return true; return true;
} }
}; };
@ -72,8 +86,8 @@ bool GUIDToString(const GUID *guid, char *buf, int buf_len) {
assert(buf_len > kGUIDStringLength); assert(buf_len > kGUIDStringLength);
int num = snprintf(buf, buf_len, kGUIDFormatString, int num = snprintf(buf, buf_len, kGUIDFormatString,
guid->data1, guid->data2, guid->data3, guid->data1, guid->data2, guid->data3,
*reinterpret_cast<const u_int32_t *>(&(guid->data4[0])), GUIDGenerator::BytesToUInt32(&(guid->data4[0])),
*reinterpret_cast<const u_int32_t *>(&(guid->data4[4]))); GUIDGenerator::BytesToUInt32(&(guid->data4[4])));
if (num != kGUIDStringLength) if (num != kGUIDStringLength)
return false; return false;